Abstract: In order to improve the economic benefit of oilfield united stations and reach the target of further energy saving, a series of studies were carried out in this paper to adopt the scientific energy utilization and saving method of distributed energy system and allocate the equipment and operation strategy of distributed energy system rationally, so that its energy output could match the energy demand of united stations. Then, the Mixed Integer Linear Programming (MILP) model for the distributed energy system of united stations was established and solved with the minimization of annual average total expenditure as the objective function and the energy balance and the safe equipment operation as the constraints. The case calculation results show that compared with the traditional centralized energy and combined cooling heating and power system, the scheme based on the solution of this MILP model is more advantageous with remarkable economic benefit, high energy efficiency and efficient energy saving and environmental protection.